Adjustable tall-square head



Feb. 3, 1948. BROCKLEY I 2,435,529

ADJUSTABLE T-SQUARE HEAD Filed May 5, 1945 2 Sheets-Sheet 1 3 INVEN TOR.

Jacaz firoozleg/ Feb. 3, 1948. J. BROCKLEY 2,435,529

ADJUSTABLE T-SQUARE HEAD Filed May 3, 1945 2 Sheets-Sheet 2 INVENTORJ @00 firaazzey Patented Feb. 3, 1948 UNITED STATES PATENT OFFICE 2,435,529 ADJUSTABLE T-SQUARE HEAD Jacob Brockiey, near Newport News, Va. Application May 3, 1945, Serial No. 591,713

This invention relates to T-squares.

An object of this invention is to provide an improved T-square wherein the head may be 'angularly adjusted with respect to the stem and locked in its adjusted position.

Another object of this invention is to provide an improved head for a T-square which is formed with a straight inner edge, and a curved semicircular outer portion which is provided with.

sockets or openings at predetermined angular positions so that the stem or shank of the square can be adjusted with respect to the head .and automatically locked in its adjusted position.

To the foregoing objects, and others which may hereinafter more fully appear, the invention consists of the novel construction, combination and arrangement of parts as will be more specifically referred to, and illustrated in the accompanying drawings, but it is to be understood that changes, variations and modifications may be resorted to which fall within the scope of the invention, as claimed.

In the drawings:

Figure 1 is a top plan of a T-square constructed according to an embodiment of this invention.

Figure 2 is a detail side elevation of the device.

Figure 3 is a fragmentary longitudinal section through the head portion of the device.

Figure 4 is a bottom plan view of the head.

Figure 5 is a sectional view taken on the line 5-5 of Figure 1.

Figure 6 is a fragmentary bottom plan of a modified form of pivotal connection between the head and the stem.

Figure 7 is a sectional view taken on the line 1-1 of Figure 6. Y

Referring to the drawings the numeral Ill designates generally a straight edge which may be provided along one edge thereof with graduations II. The elongated bar or stem l also includes a narrow bar l2 extending from one end of the bar ii), and in order to provide for resiliency between the bar l2 and bar In the inner portion of the bar [2 is reduced in thickness, as indicated at 13. A head, generally designated as M, is pivotally secured to the bar Ill. The head l4 includes a substantially semi-circular bar having a longitudinal flange i6 and the semi-circular bar I 5 extends from the outer portions of a right angular bar II,

The right angled bar I! extends beyond the inner portion or diameter of the semi-circular bar I5, as indicated at 18. The right angled bar I! has one side l9 thereof extending downwardly at right angles to the bar ID. The semi-circular 2 Claims. (01. e3 99 V bar I5 is braced with respect to the bar I! by means of at least a pair of spokes or bracing members 20.

The head I4 is pivotally mounted on a pivot member 2| which is carried by the bar I0. The pivot member 2! extends through a cylindrical bushing 22 which engages through an openin 23 formed in the central portion of the head [4, and the bushing 22 is provided with an annular flange 2 2- engaging against the upper side of the head 14.

I provide a centering pin which is composed of a conical head 2| at one end and of an intermediate spacer collar 25 which latter is formed upon its under surface with a tapered rib. The main shank of this centering pin projects beyond the collar 25. The conical head 2! of the centering pin 22 is countersunk into the rigid stem I 0, while the shank of this pin passes through a bushing 22 which projects down through the head l5 and is formed with an integral flange. The flange 26 of bushing 22 rests upon head i5 and the shank of the centering pin extends down the bushing withits lower end extending therebeyond The flange 25 has a conical seat in which the tapered rib of the spacer collar 25 isrockably located. A resilient spider 21 engages about the lower end of the centering pin, havin the arms 28 thereof upwardly divergent and engaging against the lower or inner side of the head M, as shown in,

Figure 3.

The spider 21 is tensioned by means of upsetting the lower end of the pivot member or centering pin, as indicated at 29, and preferably a washer 30 is interposed between the head formed by upsetting the lower end of the pivot member 2!, and the central portion of the spider 27.

In Figures 6 and 7 there is disclosed a modified form of pivotal connection and tensioning means for the head and stem. The stem or straight edge Illa has a pivot Zla secured thereto and the pivot member 2la extends through the bushing 22a carried by the head 14a. The pivot member 2la is provided with a tapered rib 25a engaging a seat 26a carried by the upper flange 24a of the bushing 22a.

In the present instance the lower end of the pivot member 2la is formed with a reduced diameter threaded stud 3| on which a nut 32 is threaded. The nut 32 bears against a head ten- ;i'oning spider 21a which is similar to the spider In order to provide for holding the bar III in,

3 selected angular position with respect to the head 14, I have provided a pin or stud 33 which is carried by the extension l2, The stud 33 overlies the arcuate bar l5, and is formed with a tapered lower end 34. The bar I5 is provided with a plurality of sockets 35 in a selected one of which the tapered end 34 of the pin 33 is adapted to engage. The upper side of the arcuate bar 15 may have impressed thereon degree indications 36 by means or which the user'will 'Jbeabl'e to readily shift the bar Ill and the'head H to the selected angular inclination. j

When all parts are properly positioned, as

shown particularly in Figure 3, itiawill' beiseen that the spacer collar 25 spaceslthe under side of the relatively rigid stem of 'thesqua're T in para1lel relation with respect to; the: adjacent-flat surface of the sector-shaped head IS; The resil- V ient spider arms 21 bear against the under side of the head l5.

' In the useof this combined 'r- :ami angle square when the :device is used withzthle inner e'clge of the head Id at right angles to the length of 'the bar I0, and wh'enthe fingers: of, the draftsmans hand engage the terminals'ilil of'thestraight bar l-9,. topresssame against: the side-edge 0f the drafting board upon which the rigid stem 10 rests lengthwise, pressed against the board by histhand, the head I 4 will brain the position shown in Fi'gure'l. If it' isdesire'd to change the angular relation of the bar I0 with respect to the head l4 it is only necessary-to swing th'ebar Iii on theJpivot 2| andatthis-time the extension 12 will "spring I outwardly sothat 'the lowerend of the pin 33 will ride over the upper side of th'e arcuate bar 114'. The lower end of -the stop pin 33may be positionedin the desired socket 35, as shown by thedegree indications 36, whereupon the angular relation of the barifll :withrespect to the head l4, willibe;asxrdescribed. iDue'to the angle iron construction of the sector-shaped head 5 it constitutesia rigid body, It :willrbe noted thatvthe end of the'iig'id'stemqfllathrough which the centering pinv projectsv extends in-aflatccontact over the base of this head-, thus effectively supporting it rigidly in depending relation therefrom as it projects forwardly ofa side edge or .the draftingboard.

What I claim is: p

1. In combination a rigid elongated T-square stem, formed with a flexible terminal, a sectorshaped head, a centering pin passing through the rigid end of said stem in back of said flexible terminal and composed of a. conical head countersunk into the stem, a spacer collar of larger diameter than the conical head abutting the under side of said stem, a taperedrib formed in extension of sai'dlcollar; andarmainzshankionsaid pin engaging through said head; a bushing extending through the base of said sector-shaped head and having a flange overlying the top of the latter tiltin'g'of the-sector-shaped head upon the tapered W rib,,means.carried by said shank of said centeringpin resiliently engaging the under side of the sector-shaped head to oppose downward tilting thereof, and means interposed between sectorshaped head: and thelflexible terminal-10f said stemjvforslatching the; sector-shaped headginsadjusted; positionnwith relatiomto said'stemn v 2; Asa new articleofmanufacturcazst'raight bar formed with an-lintermediatesector-shaped integral ahead, -marginally. connected-i by lintegral spokesto said straight bar, the straightbar-have in oppositenends;projecting:beyond-:.thegconfines or said-headland having a holelformed between thes-ends of one went-hereof, lwhileithe head::.is also: formed lon theccoeplanar" web of; its; marginal portionvwith a series ofssockets disposed; concene trically ofsaid hole. r

V V. cJACOBiBROCKLEY.

REFERENCES CITED 'Th'e' rollowingreferences are 'of'record in-*-t-he' file 0fthi's'pat'ent:

.UNITEDSTATES PATENTS Number a Name Date-- 475,390 Downey May 2431892 986,239 Stoddard Marfl', 1 911 1 ,1'28673 Foner Febg lfi', 1915 1377;403 Gangwis'ch Sept. 3; 19-18 -1:;295';481 Benjamin Mar; 4, 1919 

